Transmission means for control members



0t.4,193s. ,LDREY US v 2,131,797

TRANSMISSION MEANS FOR CONTROL MEMBERS Filed Dec. 6, 1954 2 Sheets-SQeet 1 l 'IIIIIIIIII/I/ INVENTOR. I Jean .tflrfqfu BY a ATTORNEY.

Oct. 4, 1938. J. DREYFUS 2,131,797

TRANSMISSION MEANS FOR CONTROL MEMBERS Filed Dec. 6, 1934 2 Sheets-Sheet 2 INVENTOR. jean .iirzyfu ATTORNEY.

Patented Oct. 4, 1938 I PATENT tOFFlCE TRANSMISSION MEANS FOR CONTROL MEMBERS, v v

Jean Dreyfus, Paris, France Application December 6, 1934, Serial No. 756,378 In France April 16, 1934 I j 8. Claims. (01. 250-44) The present invention relates to radio receivers and among the objects of the invention are a better utilization of the mounting space available for the receiver tojimprove its compactness without impairing its tonal characteristics and qualityo-f acoustic reproduction; J V L A morespecific'object of the invention is to provide a pointer operating mechanism adapted for soundpervious tuning dials disposed in front 0 of the orifice of the loudspeaker of a radio receiver or the like such as of the type described in my U. S Patent No. 2,044,759. r j

A'further object of the invention is'the provision of a mechanical transmission device for a sound pervious tuning dial and painter disposed across the orifice of a loud speaker in a radio receiver and combined with a clock and its dial associated with the tuning dial, l u

Another object ,isto' provide a mechanical transmission device in a radio receiver StlllC: turally combined with the loud speaker of the receiver adapted for operating the pointer of a tuning dial, more particularly a'soundpervious tuning dial disposed over a sound transmitting g5 orifice of the loud speaker.

' Other objects and advantages inherent in the novel design and construction of my inventionwillappear'more fully as this specification proceeds. u In; the accompanying drawings, wherein ele- Inentsfnot formingapart of the inventionhave been omitted for.cle arness of illustration, and

wherein'elements of like function are designated Figure 3 illustrates a modification of the receiver according to Figure 1; and

Figure 4 .is an. enlarged longitudinal section of the pointer shaft and its associated parts as shown in Figure 2.

Referring to Figures 1 and 2, the receiver shown comprises a cabinet 46, a chassis 51 sup-.

porting the parts of the receiver of which only the. tuning condenser having a stator and a,

rotor 56 has been shown, and a dynamic cone loud speaker 41 of known design mountedin an open ing in the frontwall of the cabinet 46. Item 31 represents a dial occupying the orifice of the loud speaker and composed of a material hav- 55 ing openings or pores therein toform a plurality of acoustic. paths to render it pervious tothe sounds generated bythe loud speaker. Thus, the dial may consist of a suitable fabric as described in more detail in my above identified patent.

The tuning dial may be provided with a plurality of scales,"each serving to indicate a different wave length range. 'In the example illustrated, three such scales. 38, 39 and 4'0 are shown arranged circularly andconcentrically and covering a. low, medium and. long Wave range in a manner well known. A movable pointer l0 mounted uponashaft 50 is arranged for rotation in synchronis'm with the tuning condenser in a manner to be presently described aand cooperates with the scales 38 to 40 whichlatter may cover different receiving wave bands in a known manner toindicate thetransmitting'stations within the respectivewave band to which thereceiver is tuned. "Aclockwork M is arranged in front of the dial supported by an upright 42 and having a pair of hands 43 and 44 cooperating with the which casethecone or diaphragm 48 of the speaker may serve as a reflector for a light source 49 mounted behind the dial and. serving for illuminating "the latter. The pointer I0 is secured to a shaft 5i) which has a reduced portion 5| mounted in a perforation of the magnet core 52 of the loud speaker in such a manner that the latter serves as a bearing for the shaft of the pointer. The rear end of the shaft has an enlarged portion 53, Figure 4; which may be secured thereto in any known manner or may be integralwith theshaft and carriesfa cam pulley 4.; having a furtherround pulley 6 rigidly connected therewith. Due to'the larger diameter of the portions 50 and 53, the center p0rtion 5l of the shaft is heldwithin and in rotatable relation to the magnet core 52. Item 3 is a cord or wire connecting the cam 4 with a pulley 2 secured to the rear end of shaft I of the variable condenser, the front end of the condenser shaft carrying a control or adjusting knob 54 for operating and tuning the receiver to a desired station in a manner well known. The ends of the cord or wire 3 aresecured to the pulleys 2 and 4 respectively in such a manner as to wind and unwind therefrom as the receiver is tuned by operating the control knob 54, thereby in turn 1 the pointer l0 cooperate in a manner similar as described but wherein a clock work 69 is mounted in front of the lower portion of the tuning dial provided with clock dial indicia 68 cooperating 'With the clock hands 10 and H. The shaft 50 may be arranged for operation in a manner similar to Figures 1 and 2.

In the embodiments of the invention as described, the loud speaker core serves as a bearing for the pointer shaftand the pulley or transmission system is mounted exteriorly of the loud speaker. In such a construction it is preferable to make the front and rear portions 50 and 53' of the pointer shaft of paramagnetic material; inorder to avoid interference with the magnetv circuit of the loud speaker core. 7

According to a preferred arrangement,-the dial is composed of-afabric 31 secured to a frame 12 which is removable from the receiver, and a'veil 13 disposed in front of the dial, the latter in turn being held or clamped. in. place by a frame 14 secured in the opening in the front wall of the receiver cabinet, The veil normally conceals the tuning indicia applied to or carried by the dial in such a manner thatthe indicia will become visible by transillumination when. the light. source 49 is lit during the operating condition of the receiver in a knownmanner. 'I'hetime indications on the other. hand are preferably carried by or applied to the veil 'l3 shownjpartly broken away in Figure 1 so as to be Visible. even when the dialis not illuminated. In both cases the clock hands may be of transparent or translucent material such as. celluloid or the. like.

If thedial having the tuning indicia thereon consists of a woven fabric .or the like with openings or pores .asnot. to obstruct'the passage of sound waves, the screen. or veil covering itwhich may also be composed of a suitable fabric or like material should be sufficiently thin, in order to afford a clear view of. the dial. when. illuminated and in order to render the same as thin as possible a certain matching of colors is desirable. Thus for instance,v a relatively opaque color for printing the indicia upon thev dial may be of gold or bronze when. using a dial of yellow color, or an opaque-white or silver color may serve for print-.

ing the tuning indicia upon a dial of white background.

It will be apparent from the above that the invention is susceptible of numerous. modifications and variations coming within the broad scope andspirit thereof as expressed in the appended claims and that the above described exemplifications should be considered in an illustrative rather than restrictive sense.

Having now fully described my invention, I

claim:

1. In a radio receiver, a loud speaker terminating in anorifice,,a sound pervious tuning dial dis.- posed across the front of the .loud' speaker. having tuning indicia thereon arranged within the circumferentialedge of the orifice of the speaker; an indicator cooperating with said tuning dial, a sound pervious clock dial, superposed. upon said tuning dial to normally conceal said tuning dial and having time markings thereon arranged within the circumferential edgeof the orifice of the loud speaker, lighting .means behind said tuning dial to cause light toappear. through said tuning dial and reveal the tuning indicia, and mechanically operated clock hands cooperating with said clockdial to indicate the time independently of said tuning dial.

2. In a radio receiver having a loud speaker, a sound pervious dial occupying a sound emitting orifice of said speaker and having tuning indicia thereon, a pointer cooperating with said tuning dial, a sound pervious clock dial superposed upon said tuning dial and having time markings thereon, means for illuminating said tuning dial and rendering said tuning indicia visible, and mechanically operated clock hands cooperating with said clock dial indicating the time independently of said tuning dial, said clock dial normally concealing said tuning dial when the latter is not illuminated and becoming light pervious by illumination, the time markings upon said clock dial being at least translucent to assist in viewing the tuning dial when illuminated.

3. In a radio receiver as claimed in claim 1 wherein said clock hands are of light pervious material to assist in viewing, the tuning indicia beneath when illuminated.

4. A radio cabinet having a loud speaker provided with. a magnetic core disposed in line with a sound emitting orifice in a wall of said cabinet, a dial of sound pervious material carrying tuning indicia, means for securing said dial to the portion=of.said wall facing the orifice, a pointer movable over said dial, said magnetic core having an opening therethrough to provide a bearing, a shaft rotatably mounted in said bearing and carrying said pointer at one end and a drive means at its opposite end, and means to operate said drive means such as to move said pointer over said dial.

5. A radio receiver according to claim 4, Wherein the pointer shaft is made of ferrous metal and forms,,at least in part, ayoke or armature for the core of the loudspeaker.

6. Aradio receiver according to claim 4, wherein the pointershaft' consists in part. of paramagnetic material and the remaining portions of diamagneticmaterial.

7. In a radio receiver, the combination of a loud speaker provided with a magnetic core and disposed in line with a sound emitting orifice in said receiver, a sound permeable tuning dial occupying saidorifice having tuning indicia thereon, an indicator cooperating with said tuning dial, a firstv shaft passing through said loudspeaker core to the rear. of the loudspeaker and utilizing said core as a bearing, said indicator being secured to the front end of said shaft, a variable tuning element, a control shaft for manually operating said tuning element, and mechanical transmission means connected between said control shaft and the rear end of said first shaft.

8. In a radio receiver, the combination of a loud speaker provided with a magnetic core and. disposed in line with a sound emitting orifice in said receiver, a-sound permeable tuning dial occupying said orifice having tuning indicia thereon, lighting means behind said tuning dial to cause light to appear through said. dial and reveal the tuning indicia thereon, anindicator cooperating with said tuning. dial, a shaft passing through said loudspeaker core to the rear of the loudspeaker and utilizing said core as a bearing, said indicator being secured tothe front end of said shaft, a variable tuning element,.a control shaft for manually operating said tuning element, andmechanical transmission means connected between said 0 control shaft and the rear end of said first shaft. 7

JEAN DREYFUS. 

